How about returning the oil? Is there a plug for it?
Or maybe I'll screw it into the injection pump access cover on the front of the engine.
Why should I ever change my oil again? I'll just add as my engine burns it.
Perhaps the thing to worry about is acidity in the oil eventually?
I was thinking of adding one to my fuel as well? And antifreeze?
Centrifuge city.
The oil has to have a very unrestricted downward gravity flow out of the centrifuge to some lower location, otherwise it'll 'back up' and slow down the turbine, which'll keep it from functioning as intended. I am not sure if the IP drive cover would work unless the CF can go mostly above it and still have room under the hood (let me know if you find that that fits- that's be a handy location). Someone else here suggested that if you deleted the mechanical fuel lift pump and replaced it with an electric FP, you could use the fuel pump mount location for a plate to return oil from a bypass filter such as a CF.
You'll also want to be sure that you get one that has a valve in it to keep oil from flowing below a certain pressure threshold-- probably less of a worry with the IDIs' robust oil system, but you don't want a CF pulling flow from the engine during conditions (primarily idle) when there may not be a lot of flow/ pressure.
I don't know that it'd be justified to use a CF for fuel unless you think you're regularly getting some really badly particle-contaminated fuel. And you'd need a new dedicated pump capable of 40+psi to drive the CF. Others here know a lot more than I do about what particle size threshold is critical for injection pumps and injectors, but CFs tend to excel at the smallest particles. Under the right applications, CFs can remove water, but they let it back out their outlet when they stop, so I wouldn't count on one in the vehicle to do anything for water in fuel.
Coolant-- well, don't want to rain on your enthusiasm, but, again, CFs do their best at really small particles, and I've never heard of those size particles being a problem in cooling systems; also, with a pressurized cooling system, I don't know how you'd re-inject from the CF outlet into the pressurized system.
Good luck and I'm interested in finding out what you do and how you do it.